CN1278639A - Self-adaptive recording method for high-density light recording, apparatus and control method thereof - Google Patents

Self-adaptive recording method for high-density light recording, apparatus and control method thereof Download PDF

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CN1278639A
CN1278639A CN00122670A CN00122670A CN1278639A CN 1278639 A CN1278639 A CN 1278639A CN 00122670 A CN00122670 A CN 00122670A CN 00122670 A CN00122670 A CN 00122670A CN 1278639 A CN1278639 A CN 1278639A
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control data
power
light output
output control
light
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CN1150524C (en
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徐赈教
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Toshiba Samsung Storage Technology Korea Corp
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00456—Recording strategies, e.g. pulse sequences
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting
    • G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10517—Overwriting or erasing
    • G11B11/10519—Direct overwriting, i.e. performing erasing and recording using the same transducing means
    • G11B11/10521—Direct overwriting, i.e. performing erasing and recording using the same transducing means using a single light spot
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

There is provided an adaptive recording method for recording binary data having marks and spaces by irradiating a light signal onto an optical recording medium and adaptively adjusting the power of the light signal according to the correlativity between the length of a mark currently being recorded and the lengths of leading/trailing spaces, the adaptive recording method including the steps of: a) checking the output characteristics of a light signal generating apparatus for generating the light signal, b) controlling the power of the light signal by referring to the power of the light signal corresponding to the correlativity and the output characteristics in recording the data on the optical recording medium. The method provides an accurate recording control by updating the light output control data corresponding to the change of the output characteristic curve of a laser diode.

Description

The adaptive recording method and the equipment that are used for high-density optic recording, and control method
The present invention relates to the high-density optic recording method and apparatus, more particularly relate to the adaptive recording method and the equipment that are used to realize best titime, and control method.
Along with the arrival of multimedia era, people more and more need high capacity recording medium.Such high capacity recording medium comprises such as magneto optical driver (MODD) or the such optical recording media of digital multi-purpose RAM disk (DVD-RAM).
When at such optical recording media identifying recording layer, require accurate high level.In addition, also need to make shake and cross erasing (cross-erase) minimum.In order to satisfy such needs, people have used " adaptive recording method ".
In adaptive recording method, export or move the most desirable record of position realization of rewrite pulse by adjusting laser according to the mutual relationship between rewrite pulse length and the front and back length at interval.
Yet the output characteristics that is used to produce the laser diode of rewrite pulse is passed in time and is changed.During the beginning operational phase, the output power levels of laser diode sharply changes with the variation of power input.But, during the smooth working stage (higher relatively), become quite slow with respect to the output power levels of the variation laser diode of power input in this stage working temperature.Therefore, in order to control laser diode, need make electric current take place sharply to change with fixed light power level.
Yet, because traditional self-adaptation recording unit is irrelevant with the variation of the output power levels of laser diode, so be difficult to realize best titime.
Elaborate now with reference to the structure and the operation of accompanying drawing to traditional self-adaptation recording unit.
In DVD-RAM, use the rewrite pulse record data of multi-pulse mode.Fig. 1 explicit declaration forms the oscillogram of the rewrite pulse of record mark in digital multi-purpose random access memory (DVD-RAM).Fig. 1 (a) shows NRZI (non-return-to-zero the is anti-phase) data of the record mark with 3T, 5T, 11T (T is the basic clock signal cycle) here, and Fig. 1 (e) shows and is used for the data shown in Fig. 1 (a) are recorded in rewrite pulse on the dish.Combination by Writing power control signal shown in the read-out power control signal shown in Fig. 1 (b), Fig. 1 (c) and the bias power control signal shown in Fig. 1 (d) obtains the rewrite pulse shown in Fig. 1 (e).
Rewrite pulse shown in Figure 1 is based on 2.6 GB (GB) DVD-RAM standard.According to 2.6 GBDVD-RAM standards, rewrite pulse is by first pulse, and multiple-pulse chain and final pulse are formed.Number of pulses in the multiple-pulse chain changes with the length of record mark, and first and final pulse keep original appearance.
The rising edge T/2 of the rising edge hysteresis record mark of first pulse.Can be the rising edge that unit moves forward and backward first pulse with 1 nanosecond (ns).For final pulse also is like this.The multiple-pulse chain is divided into several short pulses, so that can not make the record mark distortion by reducing heat history in the decline of record mark.
Irrelevant based on the formation of the rewrite pulse of 2.6 GB DVD-RAM standards and current record mark, space before and the back mutual relationship between at interval.
Therefore, when short intervening sequences is arranged, make the record mark distortion because of produce the chain accumulation at the record mark rear portion, this causes violent shake.
For fear of this problem, can use adaptive recording method.Adaptive recording method by adjusting rewrite pulse level or move its position according to record mark, space before and the back mutual relationship between at interval best titime be achieved.
Fig. 2 is used to adjust and current record mark, space before and the back block scheme of traditional self-adaptation recording unit of irrelevant rewrite pulse level at interval.
Self-adaptation recording unit shown in Figure 2 comprises data determiner 100, wave recording controller 110, rewrite pulse generator 120, laser diode (LD) driver 140, laser diode 160, automatic laser diode power control (ALPC) circuit 200, driver microcomputer (MICOM) 102, power meter storage unit 104 and multiplexer (MUX) 106.
ALPC circuit 200 comprises photodiode (PD) 202, variable gain controller (VGA) 204, comparer (comp) 206, up-down counter 208 and digital-analog convertor (DAC) 210, described circuit 200 is carried out automatic laser diode power control (ALPC) operation of the optical signal level that is used to keep LD 160 outputs, and the output of LD160 is on fixed level, as the output of the function of PD 202.
The oscillogram of the operation of the self-adaptation recording unit that Fig. 3 explicit declaration is shown in Figure 2.Fig. 3 (a) shows the waveform of NRZI data, Fig. 3 (b) shows the read-out power control signal, Fig. 3 (c) shows the Writing power control signal, Fig. 3 (d) shows the bias power control signal, Fig. 3 (e) shows the rewrite pulse based on 2.6 GB DVD-RAM, and Fig. 3 (f) shows the rewrite pulse according to adaptive recording method.
Shown in Fig. 3 (f),, the level of rewrite pulse is become level 1,2 and 3 according to mutual relationship between record mark and the front/rear interval according to adaptive recording method.
Self-adaptation recording unit shown in Figure 2 is operated with standard recording mode or self-adaptation recording mode.In the standard recording mode, by the level of the light output control data control rewrite pulse that the increasing of ALPC circuit 200/down counter 208 provides.Here, the reference voltage V_ref_w that provides by driver microcomputer 102 imposes on comparer 206.
Receive from coiling the light signal of 180 reflections with light receiving element PD 202.VGA 204 is amplified in the light signal that receives among the PD202.Comparer 206 is relatively from the voltage level of VGA 204 outputs and the level of reference voltage V_ref_w.
Here, according to the desired power setting reference voltage V_ref_w that writes pulse in the standard recording mode.If the level of light signal is higher than reference voltage V_ref_w, increase so/down counter 208 makes to subtract counting, and, if the level of light signal is lower than reference voltage V_ref_w, increase so/down counter 208 makes to increase counting.
Increase/count results of down counter 208 is light output control datas, and offer LD driver 140 by DAC 210.In the standard recording mode, MUX 106 increase/the light output control data of down counter 208 outputs offers DAC 210.
On the other hand, in the self-adaptation recording mode, utilize the level of the light output control data control rewrite pulse of storage in power meter storage unit 104.
To be described in detail in the self-adaptation recording mode operation of self-adaptation recording unit shown in Figure 2 now.In Fig. 2,104 storages of power meter storage unit comprise the power meter of the set value of the power of rewrite pulse, and wherein set value of the power depends on the mutual relationship between record mark and the front/rear interval.
Make 104 initialization of power meter storage unit by driver microcomputer 102.At initial phase, driver microcomputer 102 playback records are writing/are reading the set value of the power of the control data zone in the district, and it is stored in the power meter storage unit 104.
According to 2.6 GB DVD-RAM standards, the set value of the power that is used to specify read-out power level, Writing power level, bias power level, erasing power level and cooling power level is recorded in the control data zone.In fact, surface/groove between each groove is separately write down Writing power level, bias power level, erasing power level and cooling power level.Therefore, 9 set value of the power in control data zone, have been write down.
In order to carry out the self-adaptation record on based on the dish 180 of 2.6 GB DVD-RAM standards, the discrete data that is used for according to mutual relationship change set value of the power between record mark and its front/rear interval is necessary.Depend on that the data of mutual relationship can be stored in the flash read only memory of driver (ROM), maybe can transmit by main frame.Therefore, 102 control stores of driver microcomputer in dish 108 control data zone set value of the power and will be stored in the power meter storage unit 104, now be stored in the set value of the power that depends on mutual relationship among the flash ROM.
In order to handle the self-adaptation record, the set value of the power that depends on mutual relationship can be stored in the dish 180.In this case, driver microcomputer 102 transmission will be stored in the power meter storage unit 104, now be recorded in set value of the power in the dish 180 control data zones.
Especially, when initialization power table storage unit 104, driver microcomputer 102 converts set value of the power to the binary data that is suitable for DAC 201.In other words, have by the power level of set value of the power appointment, be used for producing the necessary light output of rewrite pulse control data and be stored in power meter storage unit 104.Be stored in the power meter storage unit 104 light output control data in addition for identical set value of the power, also the resolution characteristic with DAC 210 changes.
In carrying out the self-adaptation record, LD driver 140 is operated according to the light output control data that power meter storage unit 104 provides.In other words, LD driver 140 is controlled the rewrite pulse power level of exporting from LD 160 according to the light output control data that power meter storage unit 104 provides.
In the self-adaptation recording mode, the light that MUX 106 selects power meter storage unit 104 to provide is exported control data, and these data are offered DAC 210.
Data determiner 100 receives the NRZI data, and the mutual relationship between definite record mark and the front/rear interval, then definite result is offered power meter storage unit 104.Definite result that power meter storage unit 104 comparable data determiners 100 provide supplies with MUX 106 to the light output control data that depends on mutual relationship.
The light output control data that power meter storage unit 104 is supplied with offers LD driver 140 by DAC 210, and the light output control data that LD driver 140 provides according to DAC 210 is controlled the power level of LD 160.
Driver microcomputer 102 initialization power table storage unit 104 are put.Wave recording controller 110 output record waveform control signals, that is, according to the bias power control signal shown in the read-out power control signal shown in Fig. 3 (b) of NRZI data shown in Fig. 3 (a), the Writing power control signal shown in Fig. 3 (c) and Fig. 3 (d).
According to the wave recording control signal that wave recording controller 110 provides, rewrite pulse generator 120 produces the rewrite pulse shown in Fig. 3 (e), and is applied to LD driver 140.
According to the rewrite pulse and the light output control data that provides of DAC 210 that apply wherein, LD controller 140 drives LD 160.The rewrite pulse that offers LD 160 by flash memory to dish 180, to carry out the record of data.
The power level of rewrite pulse is done adaptive change according to the mutual relationship between record mark and the front/rear interval, shown in Fig. 3 (f).In Fig. 3 (f), power level (1) is illustrated in the power level on the back interval of mark of 3T, and power level (2) is illustrated in the power level on the back interval of the mark that power level on the back interval of mark of 5T and power level (3) be illustrated in 11T.
With reference to Fig. 3 (f), the power level of rewrite pulse changes according to wherein record mark and the back mutual relationship between at interval.For example, power level can be respectively 10mW, 11mW and 12mW.
In self-adaptation recording unit shown in Figure 2, the output characteristics of LD 160 changes with the time span of using LD 160.
Fig. 4 output characteristics of curve representation LD 160, wherein, Fig. 4 (a) is illustrated in 25 ℃ output characteristics; Fig. 4 (b) is illustrated in 60 ℃ output characteristics.
What concern between the power level of expression light output control data and rewrite pulse is different at Fig. 4 (a) with the characteristic shape shown in Fig. 4 (b).With reference to Fig. 4 (a) and Fig. 4 (b), when for two kinds of situation rewrite pulse power levels when identical, the light output control data of LD 160 when 60 ℃ of work is greater than the light output control data of LD 160 when 25 ℃ of work.Therefore, in order to reach self-adaptation record more accurately, must adjust the light output control data of power meter storage unit 104 according to the variation of the output characteristics of LD 160.
Yet, because self-adaptation recording unit shown in Figure 2 does not cover the output characteristics of LD 160, so be difficult to accurate executive logging control.
In order to address this problem, export control data corresponding to the light of set value of the power according to the output characteristics renewal of LD 160.
At first, use ALPC circuit 200 to obtain the output characteristic curve of LD 160.Specifically, two reference point a and b are set in the output power levels scope of LD 160, by the comparer 206 that offers ALPC circuit 200 corresponding to voltage V_ref_a and the V_ref_b of reference point a and b as with reference to voltage, and obtain the count results of the increasing of ALPC circuit 200/down counter 208, obtain to be used to obtain the reference light output control data Pa and the Pb of the power level corresponding with reference point a and b.
From the reference light output control data Pa of gained and the approximate output characteristic curve of Pb acquisition LD 160.
Then, by means of the approximate output characteristic curve of gained, obtain the light output control data corresponding, and it is stored in the discrete power table storage unit with the set value of the power that depends on mutual relationship.
At last, during the self-adaptation record, utilize the light output control data of in the power meter storage unit, storing, the power of control LD 160.
In order to address the above problem, an object of the present invention is to provide a kind of adaptive recording method that the laser diode output characteristics changes that is adaptive to.
Another object of the present invention provides a kind of can accurately the record, and record wherein is adaptive to the self-adaptation recording unit in the variation of laser diode output characteristics.
A further object of the present invention provides a kind of self-adaptation recording unit of the variation that is adaptive to the laser diode output characteristics by control and the control method that can accurately write down.
Therefore, in order to reach first purpose, the invention provides a kind of adaptive recording method, be used for by the irradiates light signal to the optical recording media and adjust the optical signal power record adaptively according to the mutual relationship between the length at current mark lengths that is recorded and front/rear interval and have mark and binary bit at interval, described adaptive recording method may further comprise the steps: the output characteristics of (a) checking the light signal generation equipment that is used to produce light signal; (b) reference is controlled optical signal power with mutual relationship and the corresponding optical signal power of output characteristics in the process that data is recorded on the optical recording media.
Here, step (a) comprising: (a1) step by step, obtain first reference light output control data from light signal generation equipment, be used to export light signal with first reference power; (a2) step by step obtains second reference light output control data from light signal generation equipment, is used to export the light signal with second reference power; (a3) step by step is with reference to first reference power, first reference light output control data, second reference power, the second reference output control data, the output characteristics of approximate treatment light signal generation equipment.
Also have, preferably step by step (a1) and (a2) in user data does not write down superincumbent optical recording media district, do not implement.
In order to reach second purpose, the invention provides a kind of self-adaptation recording unit, it comprises: the wave recording generator produces and the corresponding rewrite pulse control signal of binary bit with mark and interval; Laser diode drive is exported the power that control data is controlled laser diode generation and the corresponding rewrite pulse of rewrite pulse control signal and controlled this rewrite pulse according to light; Automatic laser diode power control (ALPC) circuit, FEEDBACK CONTROL rewrite pulse power remains on the predetermined reference value; The data determiner is determined the mutual relationship between record mark and the front/rear interval; The first power meter storage unit is stored and the corresponding light output of the rewrite pulse power that depends on mutual relationship control data; Arithmetical unit obtains the laser diode output characteristic curve with reference to first reference light output control data and second reference light output control data, and according to output characteristic curve output corresponding light output control data; The second power meter storage unit, the light output control data that storage is obtained by arithmetical unit; And multiplexer, the light output control data of ALPC circuit or the output of the second power meter storage unit is offered laser diode drive selectively, and the self-adaptation recording unit is used for adjusting adaptively according to the mutual relationship between the length at record mark length and front/rear interval the power of rewrite pulse.
In order to reach second purpose, the invention provides a kind of method of controlling the self-adaptation recording unit, described equipment comprises: the wave recording generator produces and the corresponding rewrite pulse control signal of binary bit with mark and interval; Laser diode drive is exported the power that control data is controlled laser diode generation and the corresponding rewrite pulse of rewrite pulse control signal and controlled this rewrite pulse according to light; Automatic laser diode power control (ALPC) circuit, FEEDBACK CONTROL rewrite pulse power remains on the predetermined reference value; The data determiner is determined the mutual relationship between record mark and the front/rear interval; The power meter storage unit is stored and the corresponding light output of the power of the rewrite pulse that depends on mutual relationship control data, and according to the mutual relationship output corresponding light output control data of determining; And multiplexer, the light output control data of power meter storage unit output is offered laser diode drive, self-adaptation equipment is adjusted the power of rewrite pulse adaptively according to the mutual relationship between record mark length and the front/rear gap length, and this method may further comprise the steps: (g) output characteristic curve by control ALPC channel check laser diode; (h) light that updates stored in the power meter storage unit by output characteristic curve is exported control data.
Here, step (g) comprises step by step following: (g1) first reference value that allows rewrite pulse to have first power is offered the ALPC circuit and obtain corresponding therewith first reference light output control data; (g2) second reference value that allows rewrite pulse to have second power is offered the ALPC circuit and obtain corresponding therewith second reference light output control data; (g3) with reference to first power, second light output control data, second power, second light output control data, the output characteristics of approximate treatment light signal generation equipment.
Also have, preferably step by step (g1) and (g2) in the optical recording media district of user data not, implement.
By the reference accompanying drawing the preferred embodiments of the present invention are described in detail, it is clearer that above-mentioned purpose of the present invention and advantage can become, wherein,
Fig. 1 explicit declaration forms the oscillogram of the rewrite pulse of record mark in digital multi-purpose RAM disk (DVD-RAM);
Fig. 2 is the block scheme of the traditional self-adaptation recording unit of explanation;
The oscillogram of traditional self-adaptation recording unit operation that Fig. 3 explicit declaration is shown in Figure 2;
Fig. 4 shows the curve of the relation of laser diode output characteristics and operating temperature;
Fig. 5 is the block scheme of explanation according to self-adaptation recording unit of the present invention;
Fig. 6 is the concept map that shows the process of checking laser diode output characteristics shown in Figure 5;
Fig. 7 explanation updates stored in the process of the light output control data in the second power meter storage unit shown in Figure 5;
Fig. 8 upgrades the process of light output control data with curve shows; With
The oscillogram of the operation of the self-adaptation recording unit that Fig. 9 explicit declaration is shown in Figure 5.
Now, with reference to the accompanying drawings to adaptive recording method and the equipment that is suitable for implementing this method elaborate.
Fig. 5 is the block scheme of explanation according to self-adaptation recording unit of the present invention.In Fig. 5, indicate with same label with the said function element shown in Fig. 2, will omit this detailed description.
In Fig. 5, label 502 indication driver microcomputers 502, the label 504 indications first power meter storage unit, the label 506 indications second power meter storage unit, label 510 indication totalizers and label 512 indication multiplexers (MUX).
What the first power meter storage unit 504 was stored in dish 108 writes/reads the set value of the power that writes down in the district.
Increase/down counter 208 comprises three and increases/down counter 208a to 208c, is respectively applied for and calculates first and second reference lighies output control data in standard recording, they are selected according to mode of operation by driver microcomputer 502.
Arithmetical unit 506 utilization is stored in set value of the power in the first power meter storage unit 504 to by first and second increasing/two reference lighies output control data Pa that down counter 208a and 208b obtain and Pb and calculate according to the light output control data of the compensating for variations of LD 160 output characteristics.The light output control data that will calculate in arithmetical unit 506 is recorded in the second power meter storage unit 508.
The light output control data that totalizer 510 provides the second power meter storage unit 508 is added to and depends on that optical track is in the predetermined value of surface or groove type between groove, offers MUX512 to addition result then.
MUX 512 selects to increase/one of light output control data that down counter 208a to 208c and totalizer 510 provide, and the data of selection are provided to DAC 210.MUX 512 selects first or second to increase/down counter 208a or 208b in compensation way, selects the 3rd to increase/down counter 208c in the general record mode, selects totalizer 510 in the self-adaptation recording mode.
To describe the operation of self-adaptation recording unit shown in Figure 5 now in detail.
Any is operated equipment shown in Figure 5 according to power meter compensation way, general record mode and the self-adaptation recording mode of the light output control data of the compensating for variations of the output characteristics of LD 160 to be used for obtaining.Here, preferably carry out the power meter compensation way periodically.
1) power meter compensation way
Carry out the power meter compensation way periodically.In other words, check the output characteristics of LD 160 and compensate the light output control data of the second power meter storage unit 508 according to check result periodically.
In the power meter compensation way, obtain first reference light output control data Pa and second reference light output control data Pb, to supply with arithmetical unit 506, by checking the output characteristics of LD 160 and upgrade the second power meter storage unit 508 with reference to the reference light output control data that obtains.
In dish 180 districts of user data not, carry out the power meter compensation way, for example in minute surface/gap (mirror/gap) part of DVD-RAM dish.In other words, the power meter compensation way is carried out synchronously with the minute surface/gap signal of expression minute surface/gap portion, and is preferably in execution in minute surface/gap portion.Previous reasons is that minute surface partly is the zone of record data not, and gap portion is the posting field of the data except that user data, and compensation way can be carried out under the prerequisite that does not influence recording operation.
In the power meter compensation way, check the output characteristics of LD 160, and compensate the 2nd power meter storage unit 508 according to check result.
Fig. 6 is the concept map that shows the process of checking laser diode 160 output characteristics shown in Figure 5.In the present invention, method of approximation is used to check the output characteristics of LD 160.Specifically, the output characteristics of supposing LD 160 is linear, obtains two reference lighies output control data Pa and Pb so on two reference point a that select on the y axle of expression rewrite pulse power and b.Obtain the curve of approximation of the output characteristics of LD 160 from two reference point a and b and corresponding reference light output control data Pa and Pb.In other words, obtain the straight line of tie point [Pa, a] and [Pb, b], be assumed to approximate output characteristic curve.
When checking the output characteristics of LD 160, driver microcomputer 502 is checked first reference light output control data Pa on the first reference point a, then, the second reference light output control data Pb of inspection on the second reference point b, by this, by output characteristic curve with reference to first reference light output control data Pa that on the first reference point a and the second reference point b, obtains respectively and second reference light output control data Pb acquisition LD 160.
In equipment shown in Figure 5, the dynamic power range of supposing LD 160 is from 2 to 15mW, and the power level of the first reference point a is 6mW so, and the power level of the second reference point b is 10mW.In order to obtain the corresponding power level of the first and second reference point a and b, acquisition will be applied to reference light output control data Pa and the Pb of LD 160.ALPC circuit 200 is used to detect reference light output control data Pa and the Pb on the first and second reference point a and b.
At first, first reference light of the first reference point a (6mW) output control data Pa is by following acquisition.Driver microcomputer 502 makes and first increases/down counter 208a work, and makes MUX 512 select first to increase/output of down counter 208a.Then, driver microcomputer 502 imposes on comparer 206 to the reference voltage V_rcf_6mW of the first reference point a that is used for determining 6mW.
The operation of response ALPC circuit 200 increases/obtains among the down counter 208a first reference light output control data Pa that is used to obtain with the power level of the corresponding rewrite pulse of first reference point of 6mW first, offer arithmetical unit 506 then.Also carry out this operation at minute surface/gap portion.
Then, second reference light of the second reference point b (10mW) output control data Pb is by following acquisition.Driver microcomputer 502 makes and second increases/down counter 208b work, and makes MUX 512 select second to increase/output of down counter 208b.Then, driver microcomputer 502 is being used for determining that the second reference voltage V_ref_10mW with reference to b of 10mv imposes on comparer 206.
The operation of response ALPC circuit 200 increases/obtains among the down counter 208b second reference light output control data Pb that is used to obtain with the power level of the corresponding rewrite pulse of second reference point of 10mW second, offer arithmetical unit 506 then.Also carry out this operation at minute surface/gap portion.
To narrate below by with reference to first reference light output control data Pa and second reference light output control data Pb, obtain the process of the output characteristic curve of LD 160 in the first reference point a and second reference point b acquisition.
Arithmetical unit 506 utilizes known method shown in Figure 6 to obtain approximate output characteristic curve with reference to first reference light output control data Pa that obtains on the first reference point a and the second reference point b and second reference light output control data Pb.Specifically, connect the coordinate [Pa, a] that defines by the first reference point a and first reference light output control data Pa, with coordinate [Pb, b], to obtain approximate output characteristic curve by the second reference point b and second reference light output control data Pb definition with straight line.
Then, upgrade the light output control data of the second power meter storage unit 508 according to the approximate output characteristic curve that obtains.
Power level according to all possible combined compensation rewrite pulse of the length at record mark length and front/rear interval.
Also have, preferably on first pulse, final pulse and a plurality of pulse train, compensate respectively.Yet, in the present invention, compensate the power level of for example first pulse and final pulse.Also have, the degree of compensation of first pulse and final pulse may be different mutually.But, in the present invention, for example understood first and at last power level obtain the situation of identical compensation.
In DVD-RAM, the short pulse length of NRZI signal is that the length of the long pulse of 3T (T is the clock signal of system cycle here) and NRZI signal is 14T.Therefore, have 12 between record mark length and the front/rear gap length 2Plant and to make up.Therefore, be used to comprise that the power meter size of all possible combination increases, and system load increases.Therefore,, record mark length and back length at interval are categorized as some representative types, such as short pulse, 4 types of short pulse, intermediate pulse and long pulses etc. in order to be easy to handle.So, can use to be used for the power meter that the back-off power level of combination is planted in 16 (4 * 4).
Fig. 7 (a) shows the content of the power meter of the back-off power level that contains representative combination, wherein according to the power level of record mark length with back length adjustment final pulse at interval.In Fig. 7 (a), G1, G2, G3 and G4 represent short pulse (3T), short pulse (4T), intermediate pulse (5T) and long pulse (6T is to 14T) respectively.
In Fig. 7 (a), record mark and back length combination at interval are presented in the left hurdle, and the set value of the power corresponding with each combination is presented in the right hurdle.When driver is started working, set value of the power is recorded in the first power meter storage unit 504 by driver microcomputer 502.
Fig. 7 (b) shows that the output characteristics to LD 160 changes response and the light output control data of compensation.Arithmetical unit 506 uses reference light output control data to make approximate output characteristic curve, and upgrades the light output control data corresponding with set value of the power with reference to the approximate output characteristic curve of making.The light output control data that has upgraded is stored in the second power meter storage unit 508.Upgrading operation repeats.The reference second power meter storage unit 508 when with self-adaptation recording mode record data.
Though Fig. 7 (a), 7 (b) illustrate an example of the adaptive recording method that depends on the mutual relationship between record mark and the interval, back, but it should be noted that adaptive recording method can be decided with the mutual relationship between record mark and space before or the front/rear interval.
Fig. 8 upgrades the process that light is exported control data with curve shows, and wherein curve a is the approximate output characteristic curve 25 ℃ of acquisitions; Curve b is the approximate output characteristic curve 60 ℃ of acquisitions.
The content that is recorded in the first power meter storage unit 504 is the data that are illustrated in the power level of the rewrite pulse that will set in the corresponding mutual relationship.For example, in the 1st row of Fig. 7 (a), the length when record mark and back interval all is G 1, that is, and G 1-G 1The time, the power level of final pulse is set to 10mW.
With reference to the curve A of Fig. 8, be 100 about the light output control data of the 10mW of the power level of LD 160.Yet with reference to the curve B of Fig. 8, exporting control data about the light of same power level is 120.
Because output characteristics depends on temperature, and temperature changes in time, so the output characteristic curve of LD 160 changes in time.When carrying out the self-adaptation record, must change light output control data according to the variation of the output characteristics of LD 160.
Arithmetical unit 506 calculates the light output control data that compensates according to mutual relationship with reference to approximate output characteristic curve, and result of calculation is stored in the second power meter storage unit 508.In the self-adaptation record computing interval, consider the second power meter storage unit 508.
In the present invention, in order to store the primary data that is used for adaptive recording method and to guarantee response, separately provide the first power meter storage unit 504 and the second power meter storage unit 508.
2) standard recording mode
In general recording mode, by ALPC circuit 200 control optical levels.In this case, the reference voltage V_ref_W that driver microcomputer 502 provides is applied to comparer 206, and uses the 3rd to increase/down counter 208c.
Wave recording controller 110 is according to the NRZI data output record waveform control signal shown in Fig. 4 (a), i.e. bias power control signal shown in Writing power control signal shown in read-out power control signal shown in Fig. 3 (b), Fig. 3 (c) and Fig. 3 (d).
Rewrite pulse generator 120 produces the rewrite pulse shown in Fig. 3 (e) according to the wave recording control signal that wave recording controller 110 provides, and this is imposed on LD driver 140.
LD driver 140 drives LD 160 according to the light output control data that its rewrite pulse that applies and DAC 210 are provided.To offer the rewrite pulse flash memory of LD 160 to coiling 180, to carry out data recording.Coiling 180 identifying recording layers by the rewrite pulse that will produce among the LD 160.
3) self-adaptation recording mode
In the self-adaptation recording mode, adjust the output level of LD 160 with reference to the compensation light output control data of storage in the second power meter storage unit 508.
In the self-adaptation recording mode, the power level of setting rewrite pulse is realized by data determiner 100, the second power meter storage unit 508, totalizer 510, MUX 512, DAC 210 and LD driver 140.
Data determiner 100 receives the NRZI data, determines the mutual relationship between record mark length and the front/rear gap length, and definite result is offered the second power meter storage unit 508.Definite result that the second power meter storage unit, 508 comparable data determiners 100 provide exports the light output control data corresponding with mutual relationship and gives totalizer 510.
Totalizer 510 is added to the light output control data of the second power meter storage unit, 508 outputs in the light output control data that depends on surface/groove between groove.Under the situation of DVD-RAM and since between groove between surperficial track and the groove track light mutual relationship distinct, so must be separately positioned between groove the power meter storage unit of using in surface and the groove.Yet, being about 0.5mW in the luminous sensitivity difference between surperficial track and the groove track between groove, its value remains unchanged on whole dish basically.Therefore, the light that surface between each groove/groove track increase is equivalent to 0.5mW is exported control data, thus, has avoided because of requiring to be provided for the hardware burden that the second power meter storage unit 508 of surface/groove causes between groove respectively.
Totalizer 510 is only exported the light output control data that the second power meter storage unit 508 provides, or output adds fixed value (the light output control data that is equivalent to about 0.5mW) according to surface/groove signal between groove the light output control data of above-mentioned data gained.Surface/groove signal produces in track controller (not shown) between groove.
By MUX 512 and DAC 210 addition result of totalizer 510 is offered LD driver 140.According to the light output control data that DAC 210 provides, the rewrite pulse level of LD driver 140 control LD 160 outputs.
Driver microcomputer 502 initialization data determiners 100, the first power meter storage unit 504, the second power meter storage unit 508 be fixed condition really.In initialization operation, being stored in the first power meter storage unit 504 from coiling the set value of the power of introducing/draw-out area of 180 reading, be stored in the first power meter storage unit 504 in the corresponding light output control data of set value of the power be stored in the second power meter storage unit 508.But, after carrying out the power meter compensation way, the light output control data that 508 storages of the second power meter storage unit are upgraded according to LD 160 output characteristics.
Wave recording controller 110 is according to the NRZI data output record waveform control signal shown in Fig. 4 (a), i.e. read-out power control signal shown in Fig. 3 (b), Writing power control signal shown in Fig. 3 (c), the bias power control signal shown in Fig. 3 (d).
According to the wave recording control signal that wave recording controller 110 provides, rewrite pulse generator 120 produces the rewrite pulse shown in Fig. 3 (e), and it is supplied with LD driver 140.
According to the light output control data that the rewrite pulse that this is applied and DAC 210 provide, LD driver 140 drives LD 160.
In the self-adaptation recording mode, ALPC circuit 200 is carried out the ALPC operation as in the general record mode.Because by being adjusted at the light output level in the self-adaptation recording mode, change and the 3rd increase/calculated value of down counter 208c, therefore, the standard recording mode can be affected.Yet, in general self-adaptation recording mode, carry out the pulse adjustment according to first and final pulse of rewrite pulse.First and the final pulse cycle be smaller than by the 200 treatable cycles of ALPC circuit.Therefore, the 3rd increases/and down counter 208c is less to be subjected to first and the influence adjusted of the level of final pulse.If be affected, so,, also be negligible so act on because the effect of level adjustment spreads on several adjacent record marks.
Be subjected to the influence of self-adaptation recording mode for fear of ALPC circuit 20, when carrying out the self-adaptation record, the ALPC circuit do not worked.Following table 1 shows the type of self-adaptation recording mode.
Form 1
????b1 ????b2 Self-adaptation recording mode type
AP_TYPE[b1，b2] ????0 ????0 First pulse
????0 ????1 Final pulse
????1 ????0 First pulse, final pulse
????1 ????1 First pulse, multiple-pulse, final pulse
Fig. 9 shows the oscillogram of basis based on the rewrite pulse of the self-adaptation recording mode of table 1.In the self-adaptation recording mode, the level of rewrite pulse changes adaptively, as shown in Figure 9.Fig. 9 (a) is presented under the situation that first impulse level changes with the mutual relationship between record mark and the space before,, 0] under the situation promptly at AP_TYPE[0, rewrite pulse; Fig. 9 (b) is presented under the situation that the final pulse level changes with record mark and the back mutual relationship between at interval,, 1] under the situation promptly at AP_TYPE[0, rewrite pulse; Fig. 9 (c) be presented at first and final pulse level situation about changing with the mutual relationship between record mark and the front/rear interval under, promptly at AP_TYPE[1,0] situation under, rewrite pulse; Fig. 9 (d) is presented under the situation that all impulse levels change with record mark and the back mutual relationship between at interval,, 1] under the situation promptly at an AP_TYPE[1 relevant only with the length of record mark, rewrite pulse.
As mentioned above, adaptive recording method according to the present invention upgrades the light output control data with respect to set value of the power by changing along with the laser diode output characteristics, accurate record controls is provided.
And the power of rewrite pulse can be according to record mark and length adaptively modifying at interval.

Claims (26)

1. adaptive recording method, be used for by the irradiates light signal to the optical recording media and adjust optical signal power adaptively according to the mark lengths of current record and the mutual relationship between the front/rear gap length, record has mark and binary bit at interval, and described adaptive recording method may further comprise the steps:
(a) check the output characteristics of the light signal generation equipment be used to produce light signal;
(b) with reference to controlling optical signal power with mutual relationship and the corresponding optical signal power of output characteristics in the process of optical recording media identifying recording layer.
2. method according to claim 1 is characterized in that, step (a) comprises step by step:
(a1), obtain first reference light output control data, be used to export light signal with first reference power from light signal generation equipment;
(a2), obtain second reference light output control data, be used to export light signal with second reference power from light signal generation equipment; With
(a3), with reference to first reference power, second reference light output control data, second reference power, the second reference output control data, the output characteristics of approximate treatment light signal generation equipment.
3. method according to claim 2 is characterized in that, carries out in the optical recording media district of user data not step by step (a1) and (a2).
4. method according to claim 2, it is characterized in that, at (a3) step by step, connect corresponding to the point of first power and first light output control data and corresponding to the point of second power and second light output control data by straight line, obtain the approximate output characteristic curve of light signal generation equipment.
5. method according to claim 1 is characterized in that, step (b) comprises step by step:
(b1) acquisition puts on the light output control data of light signal generation equipment, and wherein light signal generation equipment is used to produce the light signal that has and depend on the corresponding power level of set value of the power of each mutual relationship;
(b2) storage light output control data;
(b3) determine the mark of current record and the mutual relationship between the front/rear interval; With
(b4) with step (b3) in the corresponding light output of the mutual relationship control data determined offer light signal generation equipment.
6. method according to claim 5 is characterized in that, carries out periodically step by step (b1) and (b2).
7. method according to claim 5, it is characterized in that, optical recording media has two kinds of different tracks and described method further comprises step (b5), will be according to the difference and the addition of corresponding light output control data of luminous sensitivity between two kinds of tracks of data recording track type.
8. method according to claim 1 is characterized in that, periodically execution in step (a).
9. method according to claim 1 is characterized in that, optical recording media has the not zone of user data, and in described zone execution in step (a).
10. method according to claim 1 is characterized in that, optical recording media is a DVD-RAM dish, and in the catoptron district of DVD-RAM execution in step (a).
11. method according to claim 1 is characterized in that, optical recording media is a DVD-RAM dish, and in the interstitial area of DVD-RAM dish execution in step (a).
12. a method of controlling the self-adaptation recording unit, described equipment comprises: the wave recording generator produces and the corresponding rewrite pulse control signal of binary bit with mark and interval; Laser diode drive is according to light output control data control laser diode, to produce with the corresponding rewrite pulse of rewrite pulse control signal and to control the power of this rewrite pulse; Automatic laser diode power control (ALPC) circuit, FEEDBACK CONTROL rewrite pulse power remains on the predetermined reference value; The data determiner is determined the mutual relationship between record mark and the front/rear interval; The power meter storage unit is stored and the corresponding light output of the power of the rewrite pulse that depends on mutual relationship control data, and according to predetermined mutual relationship output corresponding light output control data; And multiplexer, the light output control data of power meter storage unit output is offered laser diode drive, described self-adaptation equipment is adjusted the power of rewrite pulse adaptively according to the mutual relationship between record mark length and the front/rear gap length, and this method may further comprise the steps:
(g) by controlling the output characteristic curve of ALPC channel check laser diode; With
(h) light that updates stored in the power meter storage unit by output characteristic curve is exported control data.
13. method according to claim 12 is characterized in that, step (g) comprises step by step:
(g1) first reference value that allows rewrite pulse to have first power is offered the ALPC circuit and obtain corresponding therewith first reference light output control data;
(g2) second reference value that allows rewrite pulse to have second power is offered the ALPC circuit and obtain corresponding therewith second reference light output control data;
(g3) with reference to first power, first light output control data, second power, second light output control data, the output characteristics of approximate treatment light signal generation equipment.
14. method according to claim 13 is characterized in that, implements in the optical recording media district of user data not step by step (g1) and (g2).
15. method according to claim 13, it is characterized in that, in (g3) step by step, by connecting point corresponding to first power and first light output control data, and, obtain the approximate output characteristic curve of light signal generation equipment corresponding to the straight line between the point of second power and second light output control data.
16. method according to claim 12, it is characterized in that, optical recording media has two kinds of different tracks and described method further comprises step (i), will be according to the difference and the addition of corresponding light output control data of luminous sensitivity between two kinds of tracks of data recording track type.
17. method according to claim 12 is characterized in that, periodically execution in step (g).
18. method according to claim 12 is characterized in that, execution in step (g) in the panel of user data not.
19. method according to claim 12 is characterized in that, optical recording media is a DVD-RAM dish, and in the mirror area of DVD-RAM execution in step (g).
20. method according to claim 12 is characterized in that, optical recording media is a DVD-RAM dish, and in the interstitial area of DVD-RAM dish execution in step (g).
21. a self-adaptation recording unit comprises:
The wave recording generator produces and the corresponding rewrite pulse control signal of binary bit with mark and interval;
Laser diode drive produces rewrite pulse that conforms to the rewrite pulse control signal and the power of controlling this rewrite pulse according to light output control data control laser diode;
Automatic laser diode power control (ALPC) circuit, FEEDBACK CONTROL rewrite pulse power remains on the predetermined reference value;
The data determiner is determined the mutual relationship between record mark and the front/rear interval;
The first power meter storage unit is stored and the corresponding light output of the rewrite pulse power that depends on mutual relationship control data;
Arithmetical unit obtains the laser diode output characteristic curve with reference to first reference light output control data and second reference light output control data, and according to output characteristic curve output corresponding light output control data;
The second power meter storage unit, the light output control data that storage is obtained by arithmetical unit; With
Multiplexer, the light output control data of ALPC circuit or the output of the second power meter storage unit is offered laser diode drive selectively, and described self-adaptation recording unit is used for adjusting adaptively according to mutual relationship between the length at record mark length and front/rear interval the power of rewrite pulse.
22. equipment according to claim 21, it is characterized in that, ALPC circuit period property output first reference light output control data and second reference light output control data, and, make arithmetical unit and the cycle synchronisation and the output of the ALPC circuit that is used to export first reference light output control data and second reference light output control data export control data with the corresponding light of set value of the power that is stored in the first power meter storage unit.
23. equipment according to claim 22, it is characterized in that, optical recording media is the DVD-RAM dish, and the mirror signal of the minute surface cycle indication of ALPC circuit and DVD-RAM is synchronous, and exports first reference light output control data and second reference light output control data.
24. equipment according to claim 22, it is characterized in that, optical recording media is the DVD-RAM dish, and the gap signal of the gap cycle indication of ALPC circuit and DVD-RAM is synchronous, and exports first reference light output control data and second reference light output control data.
25. equipment according to claim 23, it is characterized in that, further comprise totalizer, be used for the light output control data of second power meter storage unit output being added and exporting control data according to the corresponding light of the difference of luminous sensitivity between two kinds of tracks of surface between groove/groove track type.
26. equipment according to claim 24, it is characterized in that, further comprise totalizer, be used for the light output control data of second power meter storage unit output being added and exporting control data according to the corresponding light of the difference of luminous sensitivity between two kinds of tracks of surface between groove/groove track type.
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EP1061509A3 (en) 2003-01-15
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US6661759B1 (en) 2003-12-09
KR20010002872A (en) 2001-01-15
MY125184A (en) 2006-07-31
EP1061509A2 (en) 2000-12-20
EP1061509B1 (en) 2004-11-10
KR100322601B1 (en) 2002-03-18
CN1150524C (en) 2004-05-19

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